Canon EOS R5C Manual page 746

Using a USB Power Adapter to Charge/Power the Camera
Using USB Power Adapter PD-E1, you can charge Battery Pack LP-E6NH or LP-E6N
without removing it from the battery grip. The camera can also be powered.
Caution
LP-E6NH and LP-E6N can be charged together.
Otherwise, you can charge a single LP-E6NH or LP-E6N battery at a time.
LP-E6 cannot be charged this way. No battery will be charged if LP-E6NH or
LP-E6N is attached at the same time as LP-E6.
The battery is not charged if LP-E6NH or LP-E6N is loaded when DC Coupler
DR-E6C is connected.
Charging stops if you operate the camera.
When batteries are depleted, the adapter charges them. In this case, power is not
supplied to the camera.
Charging
1.
Connect the USB power adapter.
With the camera power switch set to <
adapter plug fully into the camera's digital terminal.
746
>, insert the USB power